Long microwave-photonic variable delay of linear frequency modulated waveforms

Ofir Klinger, Yonatan Stern, Thomas Schneider, Kambiz Jamshidi, Avi Zadok

Research output: Contribution to journalArticlepeer-review


The long, microwave-photonic variable delay of the impulse response of linear frequency-modulated (LFM) waveforms is proposed and demonstrated experimentally. The delay method is based on the application of a variable frequency offset to one side-band of an LFM-modulated optical carrier. Due to the time-frequency ambiguity properties of the LFM signal, the effect of the frequency offset on the impulse response is nearly equivalent to that of a group delay. Numerical simulations suggest negligible degradations in the resolution, peak-to-side-lobe ratio and integrated side-lobe ratio of the processed LFM waveform. Experiments demonstrate the delay of a 500-MHz-wide LFM signal by up to 250 ns. The method is applicable to LFM waveforms of arbitrary bandwidth and central radio-frequency. The long delays make the method attractive for optical beam-steering in large phased-array radars.

Original languageEnglish
Article number6084815
Pages (from-to)200-202
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number3
StatePublished - 2012
Externally publishedYes


  • Linear frequency modulated (LFM) waveforms
  • Microwave-photonics
  • Optical beam forming
  • Variable optical delay

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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